DTC B1014: Acc Power

DTC detecting condition: 

Voltage failure caused by poor contact of ACC power supply circuit

Trouble symptom: 

Interior light may not operate at ACC position.

Wiring diagram: 

DC power supply circuit Ref. to WIRING SYSTEM>POWER SUPPLY CIRCUIT .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B1014 displayed? (Current code)

   Yes:  Go to  2.

   No:  Go to  8.

2. CHECK DTC  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from body integrated unit.
   3. Connect the disconnected connectors.
   4. Wait approx. 2 minutes.
   5. Turn the ignition switch to ON.
   6. Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B1014 displayed? (Current code)

   Yes:  Go to  3.

   No:  Go to  8.

3. CHECK OPERATION OF OTHER FUNCTIONS  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Body Control]. (*Examples of operation checks for other functions that lead to the downstream part of the accessory 1 relay) Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .
   • ACC Input

   Does the display switch to ON when the ignition switch is turned to ACC?

   Yes:  Go to  4.

   No:  Go to  5.

4. CHECK CONNECTOR  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the body integrated unit from F/B.
   3. Check poor contact of the connector between the body integrated unit and F/B.

   Is there poor contact of connector?

   Yes:  Repair the poor contact of connector.

   No:  Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .

5. CHECK FUSE  .
   1. Turn the ignition switch to OFF.
   2. Check the fuse. Ref. to WIRING SYSTEM>POWER SUPPLY CIRCUIT>WIRING DIAGRAM .

   Is the check result OK?

   Yes:  Go to  6.

   No:  Replace the defective fuse.

6. CHECK HARNESS  .
   1. Disconnect the connector from F/B.
   2. Using a tester, measure the voltage between the battery and F/B connector.

      Connector & terminal 

      (B10) No. 1 (+) - Chassis ground (-):

   Is the voltage 8.5 - 16.5 V?

   Yes:  Go to  7.

   No:  Repair the harness between F/B and M/B.

7. CHECK RELAY  .

   Perform individual inspection of the accessory 1 relay. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>RELAY AND FUSE>INSPECTION .

   Is the check result OK?

   Yes:  Go to  8.

   No:  Replace the relay. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>RELAY AND FUSE .

8. CHECK CONNECTOR  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the body integrated unit connector and the F/B connector.

   Is the check result OK?

   Yes:  Repair or replace the poor contact of connector.

   No:  Even if DTC is displayed, the circuit has returned to a normal condition at this time.

   Reproduce the failure, and then perform the diagnosis again.

   NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.